Never name or try to find out your Guardian Angel’s name
Giving a name to things was one of God’s gifts to Adam in Eden to show his authority over everything. Remember that God brought to him creatures of lower nature (and Eve who was equal). God never gave Adam the job of naming Angels because the latter is of a higher order than men.
In the Book of Genesis, Jacob asked and failed to obtain the name of an Angel he had just wrested:
“Please tell me your name.” The Angel answered, “Why do you ask for my name?” (Genesis 32:24-29).
Samson’s mother, in the book of Judges, says:
“A man of God came to me; he had the appearance of an angel of God, fearsome indeed. I did not ask him where he came from, nor did he tell me his name. But he said to me, ‘You will conceive and bear a son…’”
Later Samson’s father asked: “What is your name, that we may honor you when your words come true?” But the Angel would not tell him:
And the Angel of the Lord said to him, “Why do you ask my name, seeing it is wonderful?” – Judges 13:18